Thread-controlling device for sewing-machines.



J. M. MERROW.

THREAD CONTROLLING DEVICE FOR SEWING MACHINES.

APPLICATION FILED AUG 16, IBM.

Patented Feb. 29, 1916.

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JOSEPH M. MERROW, or HARTFORD, CONNECTICUT, ASSIGNOR To THE MERROW MACHINE COMPANY, or HARTFORD, CONNECTICUT, a CORPORATION or CoN- THREAD-CONTROLLING- DEVIGE FOR SEWING-MACHINES.

Application filed August 16, 1911.

' To all whom it may concern:

Be it known that I, J OSEPH M. Mnnnow, a citizen of the United States, residing in the city of Hartford, county of Hartford, and State of Connecticut, have invented certain new and useful Improvements in Thread- Controlling Devices for Sewing-Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of the specification, and to the referencenumbers marked on the said drawings.

This invention has for its object to provide a thread controller for taking up and pulling off the thread and controlling the slack thereof, and is shown and described as connected with the needle mechanism and acting upon the needle thread in a three thread overseaming machine of the well known Merrow type, the general construction of which is described and referred to in Patent No. 734,987, issued July 28th, 1903, to WVilliam H. Stedman. 4

The invention consists in thread controlling devices and in the construction, relation and application thereof as described and claimed.

In the drawings: Figure l is an end elevation, showing the thread controlling devices and partially illustrating the overseaming machine. Fig. 2 is a front elevation of the needle mechanism and of the thread controlling devices and also shows in dotted lines adjacent portions of the machine. Figs. 3, 4 and5, constitute a series of views illustrating the needle and thread controller in end elevation, apart from the machine, and show several steps in the control of the needle thread.

Throughout the several figures of the drawings like reference'numbers denote the same parts.

The reference numeral 1 indicates the machine frame, 2 the head, 3 the needle plate, 4 the oscillating needle carrier, 5 the pivotal stud for the carrier, 6 the needle clamp and 7 the eye pointed curved needle. The oscillatory reciprocation of the needle is attained by means of the usual mechanism intermediate the upper main shaft 8 and the needle carrier 4 the shaft having at its end an enlarged head that is provided with a wrist pin 10 which latter forms a pivotal connection with one end of a link 11 while Specification of Letters Patent.

Patented Feb. 29, 1916.

Serial No. 644,346.

the opposite end of the link similarly engages a pin 12 on the needle carrier 4.

The numbers 13 and 14 denote loopers which cooperate with each other and with the needle in making a stitch. The number 15 denotes a well known type of thread tension and 16 a fixed thread guide.

The thread controller, denoted as a whole by the number 17, is arranged to operate between the needle 7 and the disks 15 of a thread tension which latter is shown as supported on the machine head 2. The fixed thread guide 16 is also usuallv provided but is not used when the thread tension can be easily located suitably to hold the thread in proper relation to the controller as the tension devices then act as a thread guide. The link 11 is in the machine illustrated utilized as a carrier for the thread controller 17, the latter being secured to the link bv the screw 18. The thread controller extends rearwardly and upwardly from the link 11 and near its free end there is a thread eye 19 while the extreme end portion 20 of the controller is formed as a thread engaging horn that is turned laterally slightly, as shown in Fig.2. The needle thread 21 passes between the tension disks 15 and then in turn through the eye of the thread guide 16, the eye 19 of the controller 17 and to and through the eye of the needle 7. The eye 19 of the thread controller 17 travels in a continuous curvilinear path andthe horn or point 20 travels in a path similar to that of the eve 19 but of a somewhat more amplified orbit, the said eye 19 and horn 20 (which constitute the thread engaging elements of the controller 17) each making a complete traverse of its orbit with each complete reciprocation of the needle 7 In operation and commencing with the needle at or near its highest position and with the controller nearly in a vertical position, practically as shown in Fig. 1: As the shaft 8 is turned in the direction of the arrows adjacent the shaft end 9, the needle 7 travels downward towardthe needle plate 8, the controller 17 moves backward toward the position shown in Fig. 3 and holds the needle thread taut to take up all unnecessary slack in the thread and if needed draws out thread through the tension devices. Continued turning of the shaft 8 causes the needle to be carried to its lowest position crank and a link connecting the driving crank and the needle carrier; a thread controller projecting from the link and having two thread engaging elements around which the thread is caused to intermittently make a double bend.

5. In a sewing machine; a thread guide, a thread controlling implement having two thread engaging elements located thereon and at the same side of the controllers support, a carrier supporting the controller and means for actuating the carrier whereby one of the said elements is carried into and out of engagement with the thread between the other element and the thread guide at each cycle of the controllers travel.

6. In an overseaming sewing machine; a thread controlling implement, a carrier supporting the implement, two thread engaging elements on the implement located thereon at the same side of the point of the implements support but at different distances from said support, whereby one of the said elements may o erate upon the thread to form a second bend beyond the point of operation of the other element, and means for actuating the carrier whereby the thread engaging elements of the implement are caused to travel in eccentric paths of different amplitude and of ovate form.

7. In a sewing machine, a thread control ling device including an implement having an element constituting a point of constant thread engagement and an element intermittently free from and around which a single coil of thread is developed during its operative movements, each element at intervals taking up the slack occasioned by the relief of the thread by the other element and means for supporting and actuating the implement.

8. The combination with a sewing machine having stitch-forming mechanism, thread guiding means and tension means, of a thread controller including in a single implement, a thread controlling element cooperating with a slack compensating element to pull off and control the thread, said elements being relatively nxed and one of said elements moving alternately into and out of engagement with the thread.

9. In a sewing machine and in combination with a tension, a fixed thread guide and an eye pointed needle; a thread controlling device provided with positive actuating means, and having, in a single moving implement, a constantly operative thread pas sage and an intermittently operative horn portion, cooperating with each other to alternately produce a single coil and a single bend in the thread.

J USEPH M. MERROW.

Witnesses:

ARTHUR B. JENKINS, EVA L. STOUGHTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington. D. G. 

